#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");

int nr;
int cmmdc(int a, int b)
{
    while(b!=0)
    {
        int r=a%b;
        a=b;
        b=r;

    }return a;
}

int main()
{
    int n;
    f>>n;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
            if(cmmdc(i,j)==1)
                nr++;
    g<<nr;
    return 0;
}